1 # Selectricity: Voting Machinery for the Masses
2 # Copyright (C) 2007, 2008 Benjamin Mako Hill <mako@atdot.cc>
3 # Copyright (C) 2007 Massachusetts Institute of Technology
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU Affero General Public License as
7 # published by the Free Software Foundation, either version 3 of the
8 # License, or (at your option) any later version.
10 # This program is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # Affero General Public License for more details.
15 # You should have received a copy of the GNU Affero General Public
16 # License along with this program. If not, see
17 # <http://www.gnu.org/licenses/>.
19 class SparklinesController < ApplicationController
20 # Handles requests for sparkline graphs from views.
22 # Params are generated by the sparkline_tag helper method.
25 # Make array from comma-delimited list of data values
27 if params.has_key?('results') && !params['results'].nil?
28 params['results'].split(',').each do |s|
33 send_data( Sparklines.plot( ary, params ),
34 :disposition => 'inline',
36 :filename => "spark_#{params[:type]}.png" )
40 send_data(Sparklines.plot( ))
42 # Use this type of method for sparklines that can be cached. (Doesn't work with the helper.)
44 # To make caching easier, add a line like this to config/routes.rb:
45 # map.sparklines "sparklines/:action/:id/image.png", :controller => "sparklines"
47 # Then reference it with the named route:
48 # image_tag sparklines_url(:action => 'show', :id => 42)
50 send_data(Sparklines.plot(
51 [42, 37, 89, 74, 70, 50, 40, 30, 40, 50],
52 :type => 'bar', :above_color => 'orange'
54 :disposition => 'inline',
56 :filename => "sparkline.png")